| CPC F21S 41/24 (2018.01) [F21S 43/241 (2018.01); F21Y 2115/10 (2016.08)] | 56 Claims |
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1. A directional illumination device for a vehicle external light, comprising:
an array of light sources; and
a waveguide comprising:
an input surface;
a reflective end; and
first and second guide surfaces extending between the input surface and the reflective end, wherein
the light sources of the array are arranged to input light into the waveguide through the input surface and are disposed at different input positions in a direction laterally across the waveguide; and
the first and second, opposed guide surfaces are arranged to guide input light from the input surface to the reflective end and back along the waveguide after reflection at the reflective end, the waveguide being arranged to extract input light as it is guided back along the waveguide after reflection at the reflective end and to cause the extracted light to exit through the first guide surface; and
the reflective end has positive optical power in the direction laterally across the waveguide and the waveguide is arranged to direct the extracted light in respective output illumination directions distributed in a lateral direction in dependence on the input positions of the light sources in the direction laterally across the waveguide.
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